New battery firmware destroyed my original DJI battery

I have three original DJI batteries. I upgraded the firmware on the first two, and while upgrading the third one, an error popped up at 81% that the upgrade process has failed. And now I have the issue as shown below, and the motors will not start, with that specific battery.

I tried running the firmware upgrade again, but the same error pops up saying that the firmware upgrade has failed. Currently I am draining the battery in an attempt to "reset" it perhaprs, and I have also cleaned the small square contacts, to no luck.

Much thanks for this. Also had this issue. Thought I bricked it. Just to clarify, the cable you need to remove is the smallest clip that's easiest to remove without even taking off the whole camera unit.

Then there is some truth maybe to that warning that people have been getting to turn off camera before battery upgrade!!! Everybody said it should just be ignored for p2v+.
Can someone please post a photo where exactly should that gimbal cable be disconnected? Or can the camera really be turned off in any way?

Well I had the same problem last night, today the battery upgraded and works fine.

Difference, I upgraded my firmware to 3.4 but the connected to the P2V+ with version 3.2 and upgraded all 3 batteries no problem. the corrupt battery took 2 minutes but the other 2 where done in 30 seconds.

No, battery fw is not automatically upgrded after upgrading to v3.08.
Go to page 'upgrade' within the assitant. On that page you find the possibility to update the battery fw. Beware however! ... only upgrade dji batteries from later version!